EP2922196B1 - Electronic control equipment of a permanent magnet motor - Google Patents
Electronic control equipment of a permanent magnet motor Download PDFInfo
- Publication number
- EP2922196B1 EP2922196B1 EP15159348.0A EP15159348A EP2922196B1 EP 2922196 B1 EP2922196 B1 EP 2922196B1 EP 15159348 A EP15159348 A EP 15159348A EP 2922196 B1 EP2922196 B1 EP 2922196B1
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- modulation
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- electronic control
- control equipment
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- 239000003990 capacitor Substances 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
Definitions
- the present invention relates to an electronic control equipment of an electric motor, in particular, a single-phase permanent-magnet (brushless) motor.
- an electric permanent-magnet motor or brushless motor for example, in direct current (DC)
- DC direct current
- the rotor acts as an inductor member and rotates, while the induced member, i.e., the stator, is supplied by the alternating current voltages generated by an inverter device starting from the direct current supplying voltage.
- Such inverter 500 comprises, an adjustment block 501 adapted to generate pulse-width modulated signals PWM 502, to drive the turning on/off of power transistors comprised in a power drive block 503.
- signals PWM 502 are signals having a fixed frequency and a variable duty cycle.
- the power drive block 503 generally comprises a bridge circuit structure, for example, a single-phase structure, including electronic power transistors, for example, IGBT transistors, of a type known to those skilled in the art and configured to supply an alternating current voltage 504 to the motor M1.
- a bridge circuit structure for example, a single-phase structure, including electronic power transistors, for example, IGBT transistors, of a type known to those skilled in the art and configured to supply an alternating current voltage 504 to the motor M1.
- the adjustment block 501 includes a programmable digital device, for example, a microprocessor, adapted to generate a suitable sequence of signals PWM 502 for driving the transistors of the power drive stage 503 which ensures the desired speed (or torque) to the permanent-magnet.motor M1.
- a programmable digital device for example, a microprocessor, adapted to generate a suitable sequence of signals PWM 502 for driving the transistors of the power drive stage 503 which ensures the desired speed (or torque) to the permanent-magnet.motor M1.
- the current flowing in the coils i.e., the phase current
- the phase current in the coil reaches a peak value after a rising time interval depending on the impedance of the coil itself and the speed reached by the rotor: for low speeds of the rotor, the phase current may quickly reach such peak value without an appropriate control. This may lead to several drawbacks, among which mechanical stresses on the electric motor, also referred to as torque peaks from those skilled in the art, or undesired effects of demagnetization of the permanent magnet.
- US 6 452 349 B1 discloses an analogue circuit in an electronically commuted motor, said circuit including two current limiting members so that a driving current and a braking current are both monitored.
- US 2001/009360 discloses another current limit circuit of an inverter.
- FIG. 1 a block diagram of an electronic equipment used in the industrial field for supplying power to control the movement of an electric motor M in accordance with the invention on the whole is indicated with 100.
- such electric motor M is preferably a single-phase electric motor of the permanent-magnet or brushless motor type, which can be used, for example, to move a fan heater of a gas boiler and the like.
- brushless motor comprises a rotor, composed of a permanent magnet, and a stator provided with conductive windings supplied by alternating current voltages AC.
- control equipment 100 will be referred to as control equipment or simply equipment.
- control equipment 100 comprises a stage for generating reference voltages 101 configured to generate a pulse-width modulated digital voltage signal PWM generally indicated by the reference 102.
- signal PWM 102 is preferably a fixed frequency signal, for example, 1kHz, and with a duty cycle which is variable.
- the control equipment 100 further comprises a power stage including a power drive block 103.
- Such power drive block 103 comprises a bridge circuit structure (not shown), in particular, a single-phase structure, including electronic power transistors, for example, IGBT transistors (Insulated Gate Bipolar Transistors), of a type known to those skilled in the art.
- IGBT power transistors are controllable, based on the PWM signals 102 generated by the voltage generator block, to supply an alternating-current voltage AC 104 to the electric motor M to ensure the desired speed (or torque) to the motor M, i.e., to move it.
- control equipment 100 advantageously comprises a control and adjustment stage generally indicated with the reference number 105 and enclosed by a dotted line.
- control and adjustment stage 105 is interposed between the stage for generating reference voltages 101 and the power stage 103 to receive the above-mentioned pulse-width modulated digital signal PWM 102.
- Such control and adjustment stage 105 comprises a filtering block 106, for example a low-pass filter RC, adapted to receive at a respective input the digital voltage signal PWM 102 to generate in output an analogic voltage signal or first voltage signal S1 with a fixed frequency indicative of a reference current Iref.
- a filtering block 106 for example a low-pass filter RC, adapted to receive at a respective input the digital voltage signal PWM 102 to generate in output an analogic voltage signal or first voltage signal S1 with a fixed frequency indicative of a reference current Iref.
- Such first voltage signal S1 is a signal having an amplitude substantially constant upon time, and it is suitable to take an amplitude value ranging, e.g., between 0 and 5 V.
- Such first voltage signal S1 is provided on a first input terminal, in particular, on an inverting input (-), of a comparator block or comparator 107.
- the control and adjustment stage 105 further comprises a current sensor block 108 configured to detect a current of the electric motor I M to generate a second voltage signal S2 to be sent on a second input terminal, in particular, a non-inverting input (+) of the comparator 107.
- such current sensor block 108 comprises a resistor, and the above-mentioned second voltage signal S2 is proportional to the current I M flowing in the coil of the electric motor M.
- the above-mentioned first voltage signal S1 is a signal with a constant amplitude over time and it is representative of the reference current Iref to be flown in the coil of the motor M.
- the second voltage signal S2 is, for example, a saw tooth signal.
- the comparator block 107 is adapted to generate a control voltage signal SC to enable/disable the electric power transfer to the electric motor M by the power stage 103 based on the comparison of the first voltage signal S1 with the second voltage signal S2.
- control signal SC is configured to enable the electric power transfer to the electric motor M in a first operative condition, in which an amplitude of the first voltage signal S1 is greater than an amplitude of the second voltage signal S2, and to disable such electric power transfer to the motor M in a second operative condition, in which the amplitude of the second voltage signal S2 is equal or greater than the amplitude of the first voltage signal S1.
- control signal SC is a periodic signal having a first amplitude substantially constant in a first time interval T1 to enable the electric power transfer to the electric motor M, and a second amplitude variable substantially linearly in a second time interval T2 to disable the electric power transfer to the motor M.
- control signal SC has such second amplitude increasing substantially linearly in the second time interval T2. In particular, referring to Fig. 2B , this occurs if a time duration associated with a falling edge of the above-mentioned control signal SC at a switching between the first operative condition and the second operative condition is taken as negligible.
- the first amplitude of the control signal SC during the first time interval T1 has an amplitude equal to that of a respective constant threshold signal S T .
- threshold signal S T is defined by a suitable circuitry inside the comparator block 107, i.e., it is preset in such block.
- control equipment 100 of the motor M is included in a complex control system which includes, among the other circuits, also a microprocessor 200 configured to manage such electronic equipment 100.
- control equipment is adapted to generate the. alternating current voltages supplying the stator of the motor M.
- the control and adjustment stage 105 of the electronic equipment 100 comprises an electronic modulation block 109 of the control signal SC interposed between the comparator block 107 and the power stage 103.
- Such modulation block 109 is configured to receive the control signal SC at a first input 1' and a modulation activating digital signal T OC at a second input 2' to generate a modulated control signal SC1 at a respective output 3'.
- Such modulation digital signal T OC is adapted, to take a high logic level (1 logic) to activate the modulation block 109 and a low logic level (0 logic) to deactivate it.
- Such modulation digital signal T OC comprises a plurality of rectangular voltage pulses, as shown in Fig. 4 . It shall be noted that such modulation digital signal T OC has a duty cycle indicated with the reference d. Such duty cycle, d of the modulation digital signal T OC may be varied between 0 and 1.
- such modulated control signal SC1 has a respective first amplitude substantially constant in the first time interval T1 to enable the electric power transfer to the electric motor M. Furthermore, an average value of a respective second amplitude of the modulated control signal SC1 is variable substantially linearly in a third time interval T3 that is greater than the above-mentioned second time interval T2 to disable the electric power transfer to the motor M.
- the average value of such second amplitude of the modulated control signal SC1 is increasing substantially linearly in the third time interval T3.
- the electronic modulation block 109 of the control signal SC comprises an electric network R13, R14, R17, R25, R22, C14, C15, DZ3, Q5, R1 activated at the high logic level (1 logic) of the modulation digital signal T OC .
- the electronic modulation block 109 of the control signal SC is implemented only in a portion R13, R14, C15 of such electric network R13, R14, R17, R25, R22, C14, C15, DZ3, Q5, R1 at the low logic level (0 logic) of the modulation digital signal T OC
- the comparator block 107 of the electronic control equipment 100 comprises an integrated electronic device having a plurality of input/output terminals connected to respective input/output pins 1-14.
- a first 8 and a second 9 pins are adapted to receive the first voltage signal S1 and the second voltage signal S2, respectively.
- a third pin 6 is adapted to provide the above-mentioned control signal SC or the modulated control signal SC1.
- a fourth 4 and a fifth 7 pins are connected to a power-supply potential Vcc and a ground potential GND, respectively.
- a sixth pin 3 is electrically connected to the third pin 6 to define the threshold voltage signal S T to be compared with the control signal SC or the modulated control signal SC1 to transfer power to the motor M.
- the power-supply potential Vcc is of about 15V.
- microprocessor 200 is also configured to provide the modulation digital signal T OC to be provided on the input terminal 40 of the electronic modulation block 109.
- the electric network of the modulation block 109 comprises a first R13 and a second R14 resistors connected between the first supply terminal 20 and the output terminal 50 of the network.
- a third resistor R17 is connected between the first supply terminal 20 and a first node 60 of the network.
- a fourth resistor R25 is connected between the above-mentioned first node 60 and a second node 70.
- a fifth resistor R22 is connected between the second node 70 and the output terminal 50 of the network.
- a transistor Q5 in a configuration with a common emitter, comprises the collector terminal connected to the first node 60 of the network and an emitter terminal connected to the ground potential GND.
- the base terminal of such transistor Q5 is controlled by the modulation digital signal T OC through a respective resistor R1.
- Such transistor Q5 is configured to act as a switch.
- the transistor Q5 is active (hence, in a short circuit) at the high logic level (1 logic) of the modulation digital signal T OC .
- the transistor Q5 is deactivated (hence, with an open circuit) at the low logic level (0 logic) of the modulation digital signal T OC .
- the electric network 109 further comprises a first capacitor C14 connected between the second node 70 and the ground potential GND, and a second capacitor C15 connected between the output terminal 50 of the network and the ground potential GND.
- a protection Zener diode DZ3 is connected with inverted polarity to the above-mentioned second capacitor C15 to limit the voltage on such capacitor.
- the amplitude of the control signal SC is set by the sub-network comprising the first resistor R13, the second resistor R14, and the second capacitor C15.
- the electric network 109 comprising only the first resistor R13, the second resistor R14 and the second capacitor C15, is configured to set over time the trend of the value of the amplitude of the modulated control signal SC1 present on the third pin 6 of the comparator block 107.
- the current in the motor M is adjusted based on the signal PWM 102.
- the first time interval T1 depends only by the operative conditions of the motor M. For example, the higher the value of the amplitude of the first voltage signal S1 is, the higher the duration of such first time interval will be (see Figs. 2A, 2B ).
- the second time interval T2 excluding the effect of the modulation introduced with the modulation block 109, depends on the charge of the second capacitor C15 of Fig. 3 .
- the voltage across such second capacitor C15 represents the above-mentioned control signal SC.
- Such control signal SC goes to zero at a change in the power status of the equipment 100 between the first and the second operative conditions, i.e., between a status ON (active) and a status OFF (deactivated) (see Fig. 2A ).
- the equation (3) is valid for time instants t in the power status OFF (non-active) and the transition between the status ON and the status OFF is substantially instantaneous, i.e., the transition time is equal to zero, as stated above.
- the equipment 100 of the invention allows adjusting the duration of the status OFF, in particular making such deactivated status to last more than the second time interval T2.
- such third time interval T3, besides being greater than the second time interval T2, is inversely proportional to the complement to 1 of the duty cycle d of the modulation digital signal T OC i.e., it is inversely proportional to the time fraction during which the modulation digital signal T OC is low (0 logic).
- the function carried out by the modulation block 109 may be implemented by a software executed by the microprocessor 200 itself.
- the electronic control equipment 100 of a permanent-magnet motor M of the invention has a number of advantages.
- the proposed equipment 100 allows an efficient control of the current of the motor M, by virtue of the inclusion of a current limiter, which avoids the undesired effects of the current peaks. This ensures a reduction of the noise and the vibrations of the motor in addition to a direct control of the motor itself to which the phase current is imposed.
- the extension of the second time interval T2 up to the value of the third time interval T3, i.e., the extension of the period of status OFF (deactivated) of the motor allows driving the motor M itself to lower speeds than those currently achievable.
- the current permanent-magnet motors are characterized by a rotation speeds, (round per minute, or rpm) ranging between 700 rpm and 7000 rpm.
- the control drives of a known type may modulate the rotation speed of the motor by a factor 10, i.e., they control the minimum speed of the motor up to speed values of 1/10 of the maximum speed.
- the second time interval T2 may take, for example, values of about 30-40 ⁇ s, while in the presence of a modulation, the third time interval T3 may take a value of about 100 ⁇ s to reduce the minimum rotation speed controllable at about 350 rpm.
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Description
- The present invention relates to an electronic control equipment of an electric motor, in particular, a single-phase permanent-magnet (brushless) motor.
- As it is known, an electric permanent-magnet motor or brushless motor, for example, in direct current (DC), comprises a rotor, composed of a permanent magnet, and a stator provided with conductive windings supplied by alternating current voltages AC. In such motors, the rotor acts as an inductor member and rotates, while the induced member, i.e., the stator, is supplied by the alternating current voltages generated by an inverter device starting from the direct current supplying voltage.
- An example of an inverter device or drive 500 of a known type for the control of a permanent-magnet electric motor M1 is shown by way of example in
Fig. 5 by a block diagram.Such inverter 500 comprises, anadjustment block 501 adapted to generate pulse-width modulated signals PWM 502, to drive the turning on/off of power transistors comprised in apower drive block 503. In particular, such signals PWM 502 are signals having a fixed frequency and a variable duty cycle. - The
power drive block 503 generally comprises a bridge circuit structure, for example, a single-phase structure, including electronic power transistors, for example, IGBT transistors, of a type known to those skilled in the art and configured to supply an alternatingcurrent voltage 504 to the motor M1. - Generally, the
adjustment block 501 includes a programmable digital device, for example, a microprocessor, adapted to generate a suitable sequence of signals PWM 502 for driving the transistors of thepower drive stage 503 which ensures the desired speed (or torque) to the permanent-magnet.motor M1. - In an brushless single-phase electric motor M1, e.g., a motor configured to move a fan heater of a gas boiler, the current flowing in the coils, i.e., the phase current, is strictly related to the torque required by the load: the more such torque required by the load is, the more the power input is. In general, the phase current in the coil reaches a peak value after a rising time interval depending on the impedance of the coil itself and the speed reached by the rotor: for low speeds of the rotor, the phase current may quickly reach such peak value without an appropriate control. This may lead to several drawbacks, among which mechanical stresses on the electric motor, also referred to as torque peaks from those skilled in the art, or undesired effects of demagnetization of the permanent magnet.
- In order to obviate the above-mentioned drawbacks and prevent the phase current in the coils from reaching undesired peak values, it is known to limit the maximum phase current by increasing the impedance of the coil itself. However, such measure reduces the performance of the brushless single-phase motor M1.
- Furthermore, with the known inverters or drive devices, it is not possible to efficiently control the current in the coils of the brushless motor M1 as the rotation speed of the rotor varies, i.e., both for high and low rotation speeds of the rotor. This causes undesired effects of noise and vibration of the motor.
- The document
US 6 452 349 B1 discloses an analogue circuit in an electronically commuted motor, said circuit including two current limiting members so that a driving current and a braking current are both monitored.US 2001/009360 discloses another current limit circuit of an inverter. - It is an object of the present invention to devise and provide an electronic control equipment of an electric motor, in particular a single-phase permanent-magnet (brushless) motor, having features that allow at least partially overcoming the above-indicated limitations of the known drive devices.
- Such an object is achieved by an electronic control equipment of an electric permanent-magnet motor in accordance with
claim 1. Alternative embodiments of the above-mentioned equipment are defined in the dependent claims. - Further characteristics and advantages of the above-mentioned electronic control equipment will be apparent from the description set forth below of a preferred embodiment, given by way of illustrative, non-limiting example, with reference to the appended figures, in which:
-
Fig. 1 shows a block diagram of an electronic control equipment of an electric motor in accordance with the invention; -
Figs. 2A-2B show, as a function of time, trends of electric signals managed by the electronic control equipment ofFig. 1 ; -
Fig. 3 shows a circuit scheme of a comparator block and a modulation block comprised in the electronic control equipmentFig. 1 and a microprocessor external to the equipment; -
Fig. 4 shows, as a function of time, trends of further electric signals managed by the electronic control equipment ofFig. 1 ; -
Fig. 5 shows a block diagram of a known inverter which is used in the industrial field to control the movement of an electric motor. - In the above-mentioned figures, similar or analogous elements are indicated by the same reference numerals.
- With reference to
Fig. 1 , a block diagram of an electronic equipment used in the industrial field for supplying power to control the movement of an electric motor M in accordance with the invention on the whole is indicated with 100. - It shall be noted that such electric motor M is preferably a single-phase electric motor of the permanent-magnet or brushless motor type, which can be used, for example, to move a fan heater of a gas boiler and the like. In general, such brushless motor comprises a rotor, composed of a permanent magnet, and a stator provided with conductive windings supplied by alternating current voltages AC.
- For the sake of brevity, herein below, the
electronic control equipment 100 will be referred to as control equipment or simply equipment. - In particular, the
control equipment 100 comprises a stage for generatingreference voltages 101 configured to generate a pulse-width modulated digital voltage signal PWM generally indicated by thereference 102.Such signal PWM 102 is preferably a fixed frequency signal, for example, 1kHz, and with a duty cycle which is variable. - The
control equipment 100 further comprises a power stage including apower drive block 103. Suchpower drive block 103 comprises a bridge circuit structure (not shown), in particular, a single-phase structure, including electronic power transistors, for example, IGBT transistors (Insulated Gate Bipolar Transistors), of a type known to those skilled in the art. Such IGBT power transistors are controllable, based on thePWM signals 102 generated by the voltage generator block, to supply an alternating-current voltage AC 104 to the electric motor M to ensure the desired speed (or torque) to the motor M, i.e., to move it. - Furthermore, the
control equipment 100 advantageously comprises a control and adjustment stage generally indicated with thereference number 105 and enclosed by a dotted line. In particular, such control andadjustment stage 105 is interposed between the stage for generatingreference voltages 101 and thepower stage 103 to receive the above-mentioned pulse-width modulateddigital signal PWM 102. - Such control and
adjustment stage 105 comprises afiltering block 106, for example a low-pass filter RC, adapted to receive at a respective input the digitalvoltage signal PWM 102 to generate in output an analogic voltage signal or first voltage signal S1 with a fixed frequency indicative of a reference current Iref. Such first voltage signal S1 is a signal having an amplitude substantially constant upon time, and it is suitable to take an amplitude value ranging, e.g., between 0 and 5 V. - Such first voltage signal S1 is provided on a first input terminal, in particular, on an inverting input (-), of a comparator block or
comparator 107. - The control and
adjustment stage 105 further comprises acurrent sensor block 108 configured to detect a current of the electric motor IM to generate a second voltage signal S2 to be sent on a second input terminal, in particular, a non-inverting input (+) of thecomparator 107. - In an embodiment, such
current sensor block 108 comprises a resistor, and the above-mentioned second voltage signal S2 is proportional to the current IM flowing in the coil of the electric motor M. - In accordance with an embodiment, the above-mentioned first voltage signal S1 is a signal with a constant amplitude over time and it is representative of the reference current Iref to be flown in the coil of the motor M. The second voltage signal S2 is, for example, a saw tooth signal.
- Advantageously, the
comparator block 107 is adapted to generate a control voltage signal SC to enable/disable the electric power transfer to the electric motor M by thepower stage 103 based on the comparison of the first voltage signal S1 with the second voltage signal S2. - In particular, such control signal SC is configured to enable the electric power transfer to the electric motor M in a first operative condition, in which an amplitude of the first voltage signal S1 is greater than an amplitude of the second voltage signal S2, and to disable such electric power transfer to the motor M in a second operative condition, in which the amplitude of the second voltage signal S2 is equal or greater than the amplitude of the first voltage signal S1.
- In an embodiment, referring to
Fig. 2B , such control signal SC is a periodic signal having a first amplitude substantially constant in a first time interval T1 to enable the electric power transfer to the electric motor M, and a second amplitude variable substantially linearly in a second time interval T2 to disable the electric power transfer to the motor M. - In a particular embodiment, the control signal SC has such second amplitude increasing substantially linearly in the second time interval T2. In particular, referring to
Fig. 2B , this occurs if a time duration associated with a falling edge of the above-mentioned control signal SC at a switching between the first operative condition and the second operative condition is taken as negligible. - With reference to the
Figs. 2B and4 , in theelectronic equipment 100, the first amplitude of the control signal SC during the first time interval T1 has an amplitude equal to that of a respective constant threshold signal ST. In particular, such threshold signal ST is defined by a suitable circuitry inside thecomparator block 107, i.e., it is preset in such block. - Furthermore, it shall be noted that the
control equipment 100 of the motor M is included in a complex control system which includes, among the other circuits, also amicroprocessor 200 configured to manage suchelectronic equipment 100. In particular, the control equipment is adapted to generate the. alternating current voltages supplying the stator of the motor M. - The control and
adjustment stage 105 of theelectronic equipment 100 comprises anelectronic modulation block 109 of the control signal SC interposed between thecomparator block 107 and thepower stage 103. -
Such modulation block 109 is configured to receive the control signal SC at a first input 1' and a modulation activating digital signal TOC at a second input 2' to generate a modulated control signal SC1 at a respective output 3'. - Such modulation digital signal TOC is adapted, to take a high logic level (1 logic) to activate the
modulation block 109 and a low logic level (0 logic) to deactivate it. - Such modulation digital signal TOC comprises a plurality of rectangular voltage pulses, as shown in
Fig. 4 . It shall be noted that such modulation digital signal TOC has a duty cycle indicated with the reference d. Such duty cycle, d of the modulation digital signal TOC may be varied between 0 and 1. - In particular, referring to
Fig. 4 showing an enlargement of the period T1+T2 of the control signal SC ofFig. 2B , such modulated control signal SC1 has a respective first amplitude substantially constant in the first time interval T1 to enable the electric power transfer to the electric motor M. Furthermore, an average value of a respective second amplitude of the modulated control signal SC1 is variable substantially linearly in a third time interval T3 that is greater than the above-mentioned second time interval T2 to disable the electric power transfer to the motor M. - In an embodiment of the invention, the average value of such second amplitude of the modulated control signal SC1 is increasing substantially linearly in the third time interval T3.
- Referring to
Fig. 3 , theelectronic modulation block 109 of the control signal SC comprises an electric network R13, R14, R17, R25, R22, C14, C15, DZ3, Q5, R1 activated at the high logic level (1 logic) of the modulation digital signal TOC. - The
electronic modulation block 109 of the control signal SC is implemented only in a portion R13, R14, C15 of such electric network R13, R14, R17, R25, R22, C14, C15, DZ3, Q5, R1 at the low logic level (0 logic) of the modulation digital signal TOC - The
comparator block 107 of theelectronic control equipment 100 comprises an integrated electronic device having a plurality of input/output terminals connected to respective input/output pins 1-14. - In particular, a first 8 and a second 9 pins are adapted to receive the first voltage signal S1 and the second voltage signal S2, respectively. A third pin 6 is adapted to provide the above-mentioned control signal SC or the modulated control signal SC1. A fourth 4 and a fifth 7 pins are connected to a power-supply potential Vcc and a ground potential GND, respectively. A
sixth pin 3 is electrically connected to the third pin 6 to define the threshold voltage signal ST to be compared with the control signal SC or the modulated control signal SC1 to transfer power to the motor M. - For example,. the power-supply potential Vcc is of about 15V.
- Referring to
Fig. 3 , in more detail, theelectronic modulation block 109 of the control signal SCcomprises a first 20 and a second 30 supply terminals connected to the power-supply potential Vcc and the ground potential GND, respectively. Furthermore, theelectronic modulation block 109 comprises aninput terminal 40 to receive the modulation digital signal TOC and anoutput terminal 50 connected to the third pin 6 of thecomparator block 107. - It shall be noted that the
microprocessor 200 is also configured to provide the modulation digital signal TOC to be provided on theinput terminal 40 of theelectronic modulation block 109. - The electric network of the
modulation block 109 comprises a first R13 and a second R14 resistors connected between thefirst supply terminal 20 and theoutput terminal 50 of the network. A third resistor R17 is connected between thefirst supply terminal 20 and afirst node 60 of the network. A fourth resistor R25 is connected between the above-mentionedfirst node 60 and asecond node 70. A fifth resistor R22 is connected between thesecond node 70 and theoutput terminal 50 of the network. - A transistor Q5, in a configuration with a common emitter, comprises the collector terminal connected to the
first node 60 of the network and an emitter terminal connected to the ground potential GND. The base terminal of such transistor Q5 is controlled by the modulation digital signal TOC through a respective resistor R1. - Such transistor Q5 is configured to act as a switch. In particular, the transistor Q5 is active (hence, in a short circuit) at the high logic level (1 logic) of the modulation digital signal TOC. Vice versa, the transistor Q5 is deactivated (hence, with an open circuit) at the low logic level (0 logic) of the modulation digital signal TOC.
- The
electric network 109 further comprises a first capacitor C14 connected between thesecond node 70 and the ground potential GND, and a second capacitor C15 connected between theoutput terminal 50 of the network and the ground potential GND. A protection Zener diode DZ3 is connected with inverted polarity to the above-mentioned second capacitor C15 to limit the voltage on such capacitor. - It shall be noted that, in the case that the
electronic equipment 100 does not provide for any modulations on the control signal SC, i.e., theinput terminal 40 of thenetwork 109 is always at a low logic value, the amplitude of the control signal SC is set by the sub-network comprising the first resistor R13, the second resistor R14, and the second capacitor C15. - In case of a modulation on the control signal SC, at the low logic level (0 logic) of the modulation digital signal TOC, the
electric network 109, comprising only the first resistor R13, the second resistor R14 and the second capacitor C15, is configured to set over time the trend of the value of the amplitude of the modulated control signal SC1 present on the third pin 6 of thecomparator block 107. - In more detail, with reference again to the
Figs. 2B ,3 , and4 , with theequipment 100 of the invention the current in the motor M is adjusted based on thesignal PWM 102. Referring toFig. 2B , the control signal SC, generated starting from the first S1 and second S2 voltage signals, where the first signal S1 is generated starting from thesignal PWM 102, has a frequency that may be expressed by the equation: - The first time interval T1 depends only by the operative conditions of the motor M. For example, the higher the value of the amplitude of the first voltage signal S1 is, the higher the duration of such first time interval will be (see
Figs. 2A, 2B ). - The second time interval T2, excluding the effect of the modulation introduced with the
modulation block 109, depends on the charge of the second capacitor C15 ofFig. 3 . In particular, the voltage across such second capacitor C15 represents the above-mentioned control signal SC. Such control signal SC goes to zero at a change in the power status of theequipment 100 between the first and the second operative conditions, i.e., between a status ON (active) and a status OFF (deactivated) (seeFig. 2A ). -
- When the control signal SC, during the rising, is equal to the threshold signal ST, the change in the power status between the status OFF (non-active) to the status ON (active) occurs.
-
- It shall be noted that the equation (3) is valid for time instants t in the power status OFF (non-active) and the transition between the status ON and the status OFF is substantially instantaneous, i.e., the transition time is equal to zero, as stated above. In particular, t=0 is assumed at the transition between the status ON and the status OFF and it is assumed that, at such instant, SC(t) of the equation (3) is equal to zero.
-
- In the case where the
modulation circuit block 109 and the modulation digital signal TOC are activated, theequipment 100 of the invention allows adjusting the duration of the status OFF, in particular making such deactivated status to last more than the second time interval T2. - In particular, with reference to
Figs. 3 and4 , when the modulation signal TOC takes a low logic value (0 logic), the trend of the control signal SC can be expressed as in the equation (3). -
- In such a manner, by using a modulation digital signal TOC having a frequency that is at least one order of magnitude greater than the frequency of the control signal SC of the equation (1), i.e., a frequency at least ten times greater than fSC, and assuming that the discharge resistance RDIS of the equation (6) is much greater than the equivalent resistance Req of the equation (2), it is possible to obtain that the above-mentioned third time interval T3 can be expressed as:
- In another embodiment of the present invention, the function carried out by the
modulation block 109 may be implemented by a software executed by themicroprocessor 200 itself. - The
electronic control equipment 100 of a permanent-magnet motor M of the invention has a number of advantages. - First, the proposed
equipment 100 allows an efficient control of the current of the motor M, by virtue of the inclusion of a current limiter, which avoids the undesired effects of the current peaks. This ensures a reduction of the noise and the vibrations of the motor in addition to a direct control of the motor itself to which the phase current is imposed. - Furthermore, unlike the known inverter or drive devices, with the
equipment 100 it is possible to efficiently control the current, in the coils of the brushless motor M as the rotation speed of the rotor varies, i.e., both for high and low rotation speeds of the rotor. - In particular, the extension of the second time interval T2 up to the value of the third time interval T3, i.e., the extension of the period of status OFF (deactivated) of the motor, allows driving the motor M itself to lower speeds than those currently achievable.
- For example, the current permanent-magnet motors are characterized by a rotation speeds, (round per minute, or rpm) ranging between 700 rpm and 7000 rpm. In other terms, the control drives of a known type may modulate the rotation speed of the motor by a
factor 10, i.e., they control the minimum speed of the motor up to speed values of 1/10 of the maximum speed. - With the
electronic equipment 100 of the invention, once the maximum speed has been set, by adjusting the duty cycle d of the modulation digital signal TOC, it is possible to efficiently control the motor also for speeds lower than 700 rpm, for example to speeds of 300-400 rpm. - In such a case, in the absence of a modulation, the second time interval T2 may take, for example, values of about 30-40 µs, while in the presence of a modulation, the third time interval T3 may take a value of about 100 µs to reduce the minimum rotation speed controllable at about 350 rpm.
- In other terms, it is possible with the present invention to extend the range of speed control values applicable to the permanent-magnet motor.
Claims (12)
- An electronic equipment (100) for the control of the movement of a single-phase permanent-magnet electric motor (M), comprising:- a stage (101) for generating reference voltages adapted to generate a pulse-width modulated digital signal PWM (102) ;- a power stage (103) adapted to transfer electric power to the electric motor (M) to move it;- a control and adjustment stage (105) interposed between said stage for generating reference voltages (101) and said power stage (103) to receive said pulse-width modulated digital signal PWM (102), the control and adjustment stage (105) comprising a comparator block (107) adapted to generate a control signal (SC) to enable/disable the electric power transfer to the electric motor (M) by the power stage (103) based on the comparison of a first voltage signal (S1) and a second voltage signal (S2), said first voltage signal (S1) being representative of a reference current (Iref) and generated based on the pulse-width modulated digital signal PWM (102), said second voltage signal (S2) being representative of a current (IM) flowing in a coil of the electric motor (M),wherein said control signal (SC) is a periodic signal having a first amplitude which is a constant value in a first time interval (T1) to enable the electric power transfer to the electric motor (M), and a second amplitude which is variable linearly in a second time interval (T2) to disable the electric power transfer to the motor (M), and wherein said control and adjustment stage (105) further comprises an electronic modulation block (109) of the control signal (SC) interposed between the comparator block (107) and the power stage (103), said modulation block (109) being adapted to receive the control signal (SC) at a first input (1') and a modulation digital signal (TOC) at a second input (2') to generate a modulated control signal (SC1) at an output (3'), said modulated control signal (SC1) having a further first amplitude which is a constant value in said first time interval (T1) to enable the electric power transfer to the electric motor (M), and having a further second amplitude the average value of which is variable linearly in a third time interval (T3) that is greater than said second time interval (T2) to disable the electric power transfer to the motor (M),characterized in thatsaid electronic modulation block (109) includes an electric network comprising:- first (20) and second (30) supply terminals connected to a power-supply potential (Vcc) and to a ground potential (GND), respectively;- an input terminal (40) to receive the modulation digital signal (TOC) and an output terminal (50) connected to a pin (6) of the comparator block (107) ;- a first (R13) and a second (R14) resistor connected between the first supply terminal (20) and the output terminal (50) of the network;- a third resistor (R17) connected between the first supply terminal (20) and a first node (60) of the network;- a fourth resistor (R25) connected between said first node (60) and a second node (70) of the network;- a fifth resistor (R22) connected between the second node (70) and the output terminal (50);- a NPN bipolar transistor (Q5), having a collector terminal connected to the first node (60) of the network and an emitter terminal connected to the second supply terminal (30), a base terminal of the transistor (Q5) being connected to the input terminal (40) through a further resistor (R1), to be controlled by the modulation digital signal (TOC)- a first capacitor (C14) connected between the second node (70) and the second (30) supply terminal, and a second capacitor (C15) connected between the output terminal (50) and the second (30) supply terminal;- a protection Zener diode (DZ3) connected between the output terminal (50) and the second (30) supply terminal with inverted polarity to said second capacitor (C15) to limit the voltage on such second capacitor.
- The electronic control equipment (100) according to claim 1, wherein the second amplitude of said control signal (SC) increases linearly in said second time interval (T2).
- The electronic control equipment (100) according to claim 1, wherein the average value of the further second amplitude of said modulated control signal (SC1) increases linearly in said third time interval (T3).
- The electronic control equipment (100) according to claim 1, wherein said modulation digital signal (TOC) is adapted to assume a high logic level (1 logic) to activate said modulation block (109) and a low logic level (0 logic) to deactivate it.
- The electronic control equipment (100) according to claim 1, wherein said modulation digital signal (TOC) comprises a plurality of rectangular voltage pulses with a variable duty cycle (d).
- The electronic control equipment (100) according to claim 1, wherein said comparator block (107) comprises an integrated electronic device having a plurality of input/output terminals connected to respective input/output pins (1-14), wherein a first (8) and a second (9) pins are adapted to receive the first voltage signal (S1) and the second voltage signal (S2), respectively, a third pin (6) is adapted to provide said control signal (SC) and said modulated control signal (SC1), a fourth (4) and a fifth (7) pins are connected to the power-supply potential (Vcc) and to the ground potential (GND), respectively, a fifth pin (3) is electrically connected to the third pin (6) to define a threshold voltage signal (ST) to be compared to the control signal (SC) or to the modulated control signal (SC1) in order to transfer power to the motor M.
- The electronic control equipment (100) according to claim 5, wherein said third time interval (T3) is inversely proportional to the complement to 1 of the duty cycle (d) of said modulation digital signal (TOC).
- The electronic control equipment (100) according to claim 1, wherein said control and adjustment stage (105) comprises a current sensor block (108) configured to detect said current (IM) flowing in the coil of the electric motor (M) to generate said second voltage signal (S2) .
- The electronic control equipment (100) according to claim 8, wherein said current sensor block (108) comprises a resistor and said second voltage signal (S2) is proportional to said current (IM) flowing in the coil of the electric motor (M).
- The electronic control equipment (100) according to claim 1, wherein said control and adjustment stage (105) comprises a filtering block (106) adapted to receive in input said pulse-width modulated digital signal PWM (102) to generate in output said first voltage signal (S1).
- The electronic control equipment (100) according to claim 10, wherein said filtering block (106) comprises a low-pass R-C filter.
- A single-phase permanent-magnet electric motor (M), comprising:- a rotor, composed of a permanent magnet, acting as a rotating member of the motor;- a stator provided with conductive windings supplied by alternating current voltages,- an electronic control system comprising:a microprocessor (200), andan electronic control equipment (100) in accordance with any of the claims 1-11, which is adapted to generate said alternating-current voltages to supply the stator.
Applications Claiming Priority (1)
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ITMI20140431 | 2014-03-17 |
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EP2922196A2 EP2922196A2 (en) | 2015-09-23 |
EP2922196A3 EP2922196A3 (en) | 2016-05-25 |
EP2922196B1 true EP2922196B1 (en) | 2022-04-06 |
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EP15159348.0A Active EP2922196B1 (en) | 2014-03-17 | 2015-03-17 | Electronic control equipment of a permanent magnet motor |
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EP (1) | EP2922196B1 (en) |
PL (1) | PL2922196T3 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19949804A1 (en) * | 1998-11-09 | 2000-05-11 | Papst Motoren Gmbh & Co Kg | Electronically commutated motor has arrangement that alters duty ratio of bridge control PWM signal depending on motor parameters to reduce current generated by motor if braking current exceeds threshold |
KR20010075919A (en) * | 2000-01-21 | 2001-08-11 | 구자홍 | Current limit circuit of inverter refrigerator |
-
2015
- 2015-03-17 EP EP15159348.0A patent/EP2922196B1/en active Active
- 2015-03-17 PL PL15159348.0T patent/PL2922196T3/en unknown
Non-Patent Citations (1)
Title |
---|
ERTAN H B ET AL: "A pulse frequency modulated drive for a wide speed range application", POWER ELECTRONIC DRIVES AND ENERGY SYSTEMS FOR INDUSTRIAL GROWTH, 1998 . PROCEEDINGS. 1998 INTERNATIONAL CONFERENCE ON PERTH, WESTERN AUSTRALIA 1-3 DEC. 1998, PISCATAWAY, NJ, USA,IEEE, vol. 2, 1 December 1998 (1998-12-01), pages 546 - 551, XP010720755, ISBN: 978-0-7803-4879-0 * |
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EP2922196A2 (en) | 2015-09-23 |
EP2922196A3 (en) | 2016-05-25 |
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